Stromatolitic Dolomite SD159 prehnite PU120 Purple Chalcedony rough rock

PU120  Purple Chalcedony rough rock

CLA230   A slab

120 mm x 70 mm x 45 mm thick

From the Pilbara region of Western Australia

From north of Newman in the Pilbara region of Western Australia

Stromatolitic Dolomite SD159 prehnite PU120 Purple Chalcedony rough rockSD159 Stromatolitic Dolomite slab, polished on one side. Sections consist of a chaotic mixture of dolomite and or stromatolite fragments set in a matrix of mudstone and or coarsely crystalline dolomite . The pink and red colouration can be attributed to the presence of finely disseminated iron oxides . It often contain layers and nodules of red chert. From the Irregully Formation, Western Australia. Dimensions approximately 165mm x 105mm x 8mm thick